OPTIFLUX 7300 Electromagnetic Flowmeter

Source: KROHNE, Inc.

The OPTIFLUX 7300 is a an electromagnetic flowmeter (EMF) for measuring very low conductivity liquids (≥0.05 μS/cm). The high-end meter is particularly suitable for applications with extremely adhesive and greasy media that tend to form an insulating film. It is also the first choice for applications involving high vibration and noise as well as oxidizing, abrasive or toxic chemicals. The leak-tight, vacuum and temperature resistant ceramic tube construction also complies with regulations of the food industry (FDA, EC1934/2004). Therefore, hygienic flow measurement with advanced requirements is another field of application.

The electrodes of the OPTIFLUX 7300 are designed as large-area capacitor plates, mounted behind the ceramic liner. Unlike conventional EMFs, its electrodes have no direct contact with the process liquid. The non-contacting capacitive signal pickup between medium and electrodes enables reliable measurement even in the event of non-conductive product build-up on the tube wall. The flowmeter comes with flange or as flangeless and space-saving wafer version. It features advanced diagnostics and multiple digital communication options. A full on-site verification of the OPTIFLUX 7300 without process interruption can be carried out using the OPTICHECK service tool.

Product highlights

  • Bi-directional flow measurement over a wide dynamic range
  • High chemical resistance: Designed for aggressive, toxic and abrasive media
  • Stable measurement in noisy applications, no insulation of electrodes
  • 100% diffusion tight ceramic sensor material
  • Excellent long term stability and accuracy
  • Extensive sensor and process diagnostics (incl. NE 107)
  • Flange or sandwich version
  • Optional extra robust flanged design for heavily vibrating constructions
  • Suited for hygienic use (conforms with FDA, EC1935/2004; EHEDG certified)
  • Full bore design: No moving parts, no wear, no pressure loss
  • On-site verification of flowmeter with OPTICHECK service tool

Typical applications


  • Advanced applications with very low conductivity media (≥0.05 μS/cm)
  • Toxic, aggressive and abrasive media with solid content up to 70%
  • Cost-effective alternative for applications associated with ultrasonic and Coriolis mass flowmeters

Chemical and other process industries

  • Precise volumetric dosing of additives
  • Corrosive, abrasive liquids and slurries
  • Dosing of adhesives and fibrous products
  • Emulsions incl. latex, emulsion paints etc.
  • (Bio-)alcohols, spirits, glycols, glycerine
  • Organic mass production
  • Oil based products

Food and beverage industry

  • Hygienic blending, dosing and batching
  • Fatty and oily products (e.g. vegetable oils)
  • Creamy and dairy products (e.g. fat, cream, milk, cheese, yoghurt with fruit particles)

Minerals and mining industry

  • Inhomogeneous and abrasive fluids
  • Cement and similar applications

Water and wastewater industry

  • Sludge and sewage
  • Water mixed with fat, oil and grease (e.g. in anaerobic co-digestion)
  • Irrigation

Pulp and paper industry

  • Chemically aggressive fibrous products
  • Products that form a film insulating the electrodes (waterglass)